Compilare: user.cpp: In function ‘bool x_includes_y(std::string, std::string)’: user.cpp:19:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<x.size()&&j<y.size()){ ^ user.cpp:19:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<x.size()&&j<y.size()){ ^ user.cpp:23:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j==y.size())return true; ^ user.cpp: In function ‘int main()’: user.cpp:34:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v[i].size()>mx){ ^ user.cpp:37:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] }else if(v[i].size()==mx){ ^